l-carnitine fumarate uses Vitacost, Fumarate, 500 mg, 60 Capsules L-Carnitine

And rather than being metabolized, excess carnitine is excreted in the urine as needed via the kidneys to maintain stable blood concentrations

It doesn't say base

According to recent studies, vegetarian and vegan diets can be successfully used in FM management [22], as plant-based diets have a positive anti-inflammatory effect on gut microbiome and, in general, help resist systemic inflammation [23]

This new method opens up possibility for fast and easy assay of carnitine enantiomers

Diet is an easy place to start, along with assessing whether you may suffer from low stomach acid or one of the aforementioned (and very common) nutrient deficiencies

The choice of sport-specific populations should also be considered in future experiments